请各位帮我看下这个Java的投票程序哪里错了？谢谢

Question

要求是自己创建一个VotingMachine的class,然后用Election测试结果，要求是一共15票，投票给3个人，每个人的票数不可以有 0 。 我VotingMachine写的是
======================
  public class VotingMachine{       private int green;
       private int republican;
       private int democrat;    public VotingMachine(){
       green = 0;
       republican = 0;
       democrat = 0;}
    public void voteForGreen(){          green = green + 1;}    public void voteForRepublican(){
  
          republican = republican + 1;}    public void voteForDemocrat(){
  
          democrat = democrat + 1;}   public int getGreenVotes(){       return green;}   public int getRepublicanVotes(){       return republican;}     public int getDemocratVotes(){       return democrat;    }
     
   public void clear(){
       green = 0;
       republican = 0;
       democrat = 0;   }然后我的Election.java写的是
==============
public class Election
{     public static void main(String[] args)
{
     
     VotingMachine voteResult = new VotingMachine();
     voteResult.voteForGreen(7);
     voteResult.voteForRepublican(1);
     voteResult.voteForDemocra(7);
     System.out.println(voteResult.getGreenVotes());
     System.out.println(voteResult.getRepublicanVotes());
     System.out.println(voteResult.getDemocratVotes());
     
   }     voteResult.clear();}
======================================================请各位帮我看下这个哪里错了，怎么改正好么？谢谢 

Answer 1

voteResult.voteForGreen(7);==> public void voteForGreen(int);
缺少相应函数定义，补上即可：
public void voteForGreen(int n){
   green = n;
}
其它依此类推。

Answer 2

public class Election
{     public static void main(String[] args)
{
     
     VotingMachine voteResult = new VotingMachine();
     voteResult.voteForGreen(7);
     voteResult.voteForRepublican(1);
     voteResult.voteForDemocra(7);
     System.out.println(voteResult.getGreenVotes());
     System.out.println(voteResult.getRepublicanVotes());
     System.out.println(voteResult.getDemocratVotes());
     voteResult.clear();//----------------------
     voteResult = null; //----------------------
   }
}
注意变量作用域。